No Repository Found - conflicting dependency

Hello,

I've run into an error, trying to update FlexBuilder 4.5 - I don't know whether it's related to ExtensionBuilder or not, anyway here it goes.

I select the Help - Software Updates menu entry in FB 4.5, and after a while it appears this window:

The details seems to be:

The ugly path you see is where I did unzip the ExtensionBuilder package.

Actually, that folder was missing (I moved it), but even restoring the original path and files leads to nothing better: the red ! warning disappears, but I still have the conflicting dependency error.

Any hint?

Thanks

Davide